Now that I have the box in front of me...
The lot is #RA5048
The back of the box reads:
These cartridges are adapted to the following arms...Colt-Offical Police, Officers' Model, Shooting Master, New Service, Police Positive Special, Single Action Army, Detective Special, Smith & Wesson Super Police, Military & Police, Outdoorsmans'.
There are three addresses on the back of the box:
Bridgeport Conn, Ilion NY, Kings Mill OH
Maybe that will help with dating it.
(I had to google what SWAG meant.
)